How to get a background audio recording file that is not found in the attachment

Dear Community,
I use KoboToolbox audio background recording facility, with OCHA server. In two days I can’t find the attachment file. Is it because you have passed the quota limit? How can I get the file ?. Given the importance of these files

@akoh, is it that all the background audio is missing or is it that only some files are missing from the project?

Only some files are missing

OK, so how many records (submissions) does your survey project have? Could you also let us know the average file size of your background recording? Maybe this should also give us a clue of your issue.